Patents by Inventor Franz Widmer

Franz Widmer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Nuclear halogenated .alpha.,.alpha.'-bis(cyclopentadienyl)xylene
    Patent number: 4140843
    Abstract: New halogenated bis(cyclopentadienyl) compounds of the general formula ##STR1## in which X represents a halogen atom having an atomic number of at most 35, that is to say a fluorine, bromine or preferably chlorine atom, R.sub.1 and R.sub.1 ' each represents a hydrogen atom or a methyl group, and n = 1, 2, 3 or 4.The monomer of the formula (I) undergoes spontaneous dimerization or oligomerization respectively after it is formed. The oligomer has the formula ##STR2## WHERE P IS 2 TO 20.
    Type: Grant
    Filed: October 3, 1977
    Date of Patent: February 20, 1979
    Assignee: Ciba-Geigy AG
    Inventors: Franz Widmer, Alfred Renner, Heinz Rembold